I don't know since when I have this problem, but now it's like this - with everything reinstalled with the latest versions:
When pressing the Play-Button in Native Instruments Kore, Guru doesn't respond. It won't run anymore as slave.
Guru transport responds perfectly to Cubase in Logic, and other applications respond to the Kore transport.
But Kore/Guru doesn't seem to work anymore, though I urgently need it to work
I have to admit I never, up to now, loaded Guru into Kore2. Latest versions here as well (Guru 1.612 is latest, I guess). Here it works - setup my Guru kits and all , press play on the Kore2 hardware - works. Hmmmmm......